Usually human die at 50mA.
300mA mean u kena hexa killed (6x killed).
30mA will stop it before major damage occur to your heart.

--

This post has been edited by ceo684: Feb 6 2024, 11:07 PM

situation, add one washing machine at bathroom.

1, share water heater rccb 25a 10ma connection to the new washing machine, can?

or

2, individual new mcb 16a + new rccb 25a 10ma?

No 2 better, but you could use an RCBO and just replace the current MCB being used
No 1 I think can, because it doesn't say that 1 RCCB for 1 water heater, just that wet area be protected by 10mA RCCB. But better wait for more knowledgeable people to chime in.

I personally would do No 2.

If the water heater is on MCB C16 & washing machine is on C10, then it is kinda safe but not recommend if you want to upgrade to higher power water heater or dryer. And electrician tend to shortcut loop from 1 socket to another without checking. You will still need a new cables from DB to the socket outlet if it doesn't exist in the first place.

You can have 40A 10ma RCCB such as Hager CCA540D support 2xC20 circuits if that what you prefer but it will cost about 2x Hager 16A/25A 10ma RCCB.

Maxguard 25A 10ma RCCB is under 60 & 16A 10ma RCBO is under 65.

This post has been edited by jio: May 3 2024, 11:21 PM

I prefer option 2. I don't prefer to share because the WH itself consume a big chunk of amperage by itself.

At my parent's old house, there's no dedicated circuit for the WH with 10mA RCCD at the DB. I'm thinking to install a RCCD at the incoming power cable inside the bathroom itself (at high level above the WH) then only connect the WH cable to the RCCB. I guess this will serve the same function for protection right?

Thanks

BTW may I know is this brand EPS good enough?

Yes can.
You could also mount it near the water heater switch. There are small casings that fit only an RCCB

Hey all, my house is 27 years old 3 phase and equipped with two 300mA RCCBs.

Can I replace them both with F204 A-63/0.03? Will I experience nuisance trips on the main DB since theres so many load?

There is no extra 10mA RCCB for the solar water heater with electric backup. Do I need one? The pipes in the wall seem to be made of PPR material.

DIY replaced MCB few months ago.

Picture of my db:



This post has been edited by DroppedJaw: Jun 7 2024, 06:57 PM

Check the existing condition during normal peak usage using leakage clamp meter. If the standing leakage current is below 30% of the new RCCB, then you can proceed. Above 50% I don't recommend as the RCCB will trip at 80% or even as low as 70% of the RCCB rating. Use leakage clamp meter with 40mm or slightly larger jaw as you have to clamp 3 phase + neutral. You can get Multi M-140 for MYR320.

Hey guys, can anybody recommend a good electrician in Penang? Looking to replace the db box at my parents place. It’s a mess!

my house water heater from developer direct from MCCB C20 is this safe? the one i added one i using C16 MCB and RCCB 16A 10mA (RCCB is near the switch) and i just notice that my C16 MCB install at 63a 100mA power at DB ... this is dangerous right? another power line is 63a 30mA , should put the C16 here correct? as the developer C20 is here

This post has been edited by 13aby: Jul 15 2024, 10:56 PM

Hi guys just recently upgrade DB box. All aircon and water heater seperate MCB and RCBO. Any comment on these set up?

C6-Lighting
C20- Aircon x6, dryer x1
C32-socket
RCBO for 3 heater




This post has been edited by Lighters: Jul 18 2024, 10:21 PM

WTF are you using isolator as main switch? Use 2P MCB please. In the past long ago isolator switch was used as main switch but it is always with fuse (integrated or separate). It is long replaced with MCB, fuse holder etc. Do not use main switch without overcurrent protection.

The isolator is the one next to RCCB right. So we cant use the 2pole isolator? Replace with the MCB C63 2 pole? This isolator quite exp haha but may i know whats the difference?

Means we use 2 way MCB box cover with RCCB instead of the normal 20A switch for water heater before enter toilet?

You need the overcurrent protection which the isolator switch lack. I recommend 2P MCB instead of fuse as I've seen fuse being temporarily bypassed during emergency (burnt fuse but no replacement fuse available) which supposed to be replaced but totally forgotten/ignored by the owner.

For your case you can either
1. Replace it with 2P MCB or switchfuse
or
2. Add fuseholder (technically you can substitute this with 1P MCB but you will as well replace the isolator with 2P MCB).

Edit: The incoming seems to be connected to the RCCB. Is this sub-DB instead of the main DB?

This post has been edited by jio: Jul 19 2024, 10:50 PM

Appreciate ur replies. Which mean 2P MCB is more safer than the isolator. got it.

This is the main db. The only DB also. It should be connected to the RCCB right?

Isolator don't have overcurrent protection, but you can just add in another 63A 2P MCB after it. Followed by the RCCB.